I have theory (I think that this is theory - not matter).
Look at 1 and 2 screenshot. There are red terrans.
First picture - they guarded crystall. Second picture - they are henchmens of Duran.
I though maybe terrans on 1 and 2 picture are at the same terrans and... maybe (not sure) they are from Moebius Corps?
As you know, Moebius Corps in SC2 try finded artifacts of protoss. In 4 mission they guard artifact of protoss.
What do you think? This theory maybe live?
(If you know really situation and my theory is silly, write me please)
Thank you for attention.

I can almost guarantee this level of detail and continuity does not exist in Blizzard's campaigns. It's most likely coincidental.

I can learn from Blizzard about this? In theory.